Eee, there's a lot of improvement from you two! I'm jealous.
I've sadly not really improved much; I've not really had time to devote to enormous pieces- I'm on the final year of my degree and there's so many essays to complete!
Even so, here's an A5 commission from January 2012:
And then an A5 piece completed early October, and a speedpaint from december:
The only real difference is the use of colour, really! The latter ones have more layers painted over the line-art than the former. Here's hoping 2013 shows a bit more improvement- and the eventual jump to lineless work!